高溫乾燥時木材中心溫度、窯溫與含水率變化之關係（二）

Relationships among the Temperatures of Lumber-Center and Kiln-Air and Moisture Content Changes during High-Temperature Kiln Drying (2)

翟思湧(Sy-Yung Jai) ； 熊如珍(Ju-Chen Hsiung)

《林業試驗所研究報告季刊》 10卷2期 (1995/06) Pp. 137-144

https://doi.org/10.7075/BTFRI.199506.0137

摘要

為進一步探討木材高溫乾燥時是否可藉樣板中心溫度與窯溫之差距關係評估其最後含水率，特就3及5cm厚之檸檬桉與肖楠進行試驗。結果顯示：以110℃高溫窯乾3及5cm厚之肖楠，當樣板中心溫度升至比窯溫低約1℃(109℃)時，其平均含水率即已降至6%左右；檸檬桉不宜採行高溫乾燥；木材高溫乾燥時，可藉樣板中心溫度與窯溫之差距以評估其最後含水率，但，此一方法不適用於極易內裂之樹種。

關鍵字

高溫乾燥 ； 木材中心溫度 ； 肖楠 ； 檸檬桉

並列摘要

This is n farther study to evaluate the feasibility of using the temperature difference between lumber-renter and kiln-air as a guide far estimating the final moisture canted of the wood during high-temperature kiln drying. Lemonscented gum (Eucalyptus citriodora) and Taiwan incense-cedar (Calocedrus formosana) lumber, 3 and 5cm (T)×12cm (W)×160cm (L), were used for this study. Each group of the test boards was dried at 100℃ with mixture of steam and air process.
The results of this study indicate that:
1.The temperature difference between lumber-center and kiln-air can be used as a guide for estimating the final average moisture content of the wood during high-temperature kiln drying, but it is not suitable for some species which are susceptible to severe internal checks.
2.The final average moisture content is about 6%, when central-temperature of the samples up to 109℃ or 1℃ below the kiln air for 3 and 5cm Taiwan incensecedar to be dried at 110℃.
3.Lemon-scented gum 3 and 5cm lumber cannot be subjected to temperature about 110℃ without inflicting serious degrade from surface checks and end-grain honeycombing; in other words, high-temperature kiln drying is not a system to be used for Lemon-scented gum lumber.

並列關鍵字

High-temperature Kiln Drying ； Lumber-Center Temperature ； Taiwan incense-cedar ； Lemon-scented gum